Showing questions tagged:

Firefox having problems with streams: This video is either unavailable or not supported in this browser. (Error #4000)

Hello, I'm having a problem on Windows 10. It's a fresh windows installation and I tried already some solutions: reinstalling firefox, deleting cache, refreshing firefox,… (read more)

Hello, I'm having a problem on Windows 10. It's a fresh windows installation and I tried already some solutions: reinstalling firefox, deleting cache, refreshing firefox, private windows, no add ons, trouble shoot mod. Nothing helped. The problem seems to be with live stream, either on twitch.tv or youtube.

Solved المُؤرشفة 3 1541

Turn off swipe to navigate Back and Forward

When I swipe to the left, Firefox navigates Back & when I swipe to the right, Firefox navigates Forwards. It is VERY ANNOYING!!!! It's really easy to do this accident… (read more)

When I swipe to the left, Firefox navigates Back & when I swipe to the right, Firefox navigates Forwards. It is VERY ANNOYING!!!! It's really easy to do this accidentally while scrolling around a large web page. When you go back, it deletes all data that was filled out on the web form causing DOUBLE the work. How do I turn it off please? Win 10, FF 142.0.1 64-Bit

Solved Locked المُؤرشفة 4 1482

Enhanced Tracking Protection Blocks x.com in Windows

I've added https://x.com as an exception site but it is still blocked. https://x.com/mozilla doesn't work either Error message on the page: "Something went wrong, but … (read more)

I've added https://x.com as an exception site but it is still blocked.

https://x.com/mozilla doesn't work either

Error message on the page:

"Something went wrong, but don’t fret — let’s give it another shot.

⚠ Firefox’s Enhanced Tracking Protection (Strict Mode) is known to cause issues on x.com"

After 2 days it used to finally load without my doing anything, but not now. I never loads using Firefox.

https://x.com is added as an exception, but obviously ignored.

Tried You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

   hold down the Shift key and left-click the Reload button   

NOPE

Tried: Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings), click the padlock icon (Clear cookies and site data) for the domain in the selected tab.

"Remove the Cookies" for websites that cause problems:

   Settings -> Privacy & Security
   Cookies and Site Data: "Manage Data" 

"Clear the Cache":

   Settings -> Privacy & Security
   Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear 
   https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
   https://support.mozilla.org/en-US/kb/how-clear-firefox-cache 

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

   switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
   do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window 
   https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
   https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems 

NOPE - lost all my bookmarks, extensions, settings - not going there again thank you

as for:

You can check for issues with Enhanced Tracking Protection. Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content.

   click the shield icon for more detail and possibly disable the protection 

the sheild has a slash thru it saying "enhanced tracking is off for this site" when i put my mouse over it.

Solved المُؤرشفة 7 1365

Yahoo mail not loading.

Yahoo isn't loading at all for me, more specifically guce.yahoo.com. I have managed to get into the login.yahoo.com page and log in but after the log in process it goes t… (read more)

Yahoo isn't loading at all for me, more specifically guce.yahoo.com. I have managed to get into the login.yahoo.com page and log in but after the log in process it goes to the first page again and gives me the same "The connection has timed out". I just installed the browser and this might make me not use it ngl. I have tried both clearing cookies and troubleshooting mode.

Solved المُؤرشفة 6 1312

Browser

When I use my Modzilla Firefox browser it comes up with a Yahoo Search engine. Is FireFox and Yahoo the same?

المُؤرشفة 1 1283

Warnings of a trojan virus infection keep popping up on my other Windows 11 computer

On my Windows 11 computer messages keep cropping up supportably from Firefox. I have switched the computer off. this is from my old computer. I don't know what to do now.… (read more)

On my Windows 11 computer messages keep cropping up supportably from Firefox. I have switched the computer off. this is from my old computer. I don't know what to do now. Colin

Solved المُؤرشفة 3 1254

Invalid captcha with https://replit.com/login

Hi, On https://replit.com/login, no captcha is visible, and login in says "Your captcha token is invalid. Please refresh the page and try again.." I tested with LibreWolf… (read more)

Hi,

On https://replit.com/login, no captcha is visible, and login in says "Your captcha token is invalid. Please refresh the page and try again.."

I tested with LibreWolf 128.0.3-2 and FF 129.0.2.

With Chrome, it works.

Solved المُؤرشفة 5 1217

Shortcuts

I have various shortcuts saved on the shortcut page comes up after logging in. Its set to 2 rows.. I use it every day. Used it this morning and working perfectly. Been o… (read more)

I have various shortcuts saved on the shortcut page comes up after logging in. Its set to 2 rows.. I use it every day. Used it this morning and working perfectly. Been out and when I came back the page is totally blank. I've tried sytem restore to 5th October but makes no difference. I use Windows 10 and read that Firefox are continuing to support Windows 10 I'm visually impaired and use a desktop PC with a large screen. I'm not PC techically knowledgeable. How do I restore my shortcuts or how do I re create them?

Solved Locked المُؤرشفة 7 1145

why is firefox suddenly forcing the use of the address bar for searching.

Suddenly I cannot search from the search bar. It defaults to the address bar. why "fix" something that was not broken. Being forced to use the address bar is frustrati… (read more)

Suddenly I cannot search from the search bar. It defaults to the address bar. why "fix" something that was not broken. Being forced to use the address bar is frustrating. If you go directly to the address bar, it tells you it cannot find that site.

Solved المُؤرشفة 22 1048

firefox version 128.0.3 can't play HD amazon prime videos

Hello. Recently I've noticed video quality has been reduced on amazon prime video. I get a message saying my hardware doesn't meet HDCP requirements. I've already tried p… (read more)

Hello. Recently I've noticed video quality has been reduced on amazon prime video. I get a message saying my hardware doesn't meet HDCP requirements.

I've already tried playing the same video on edge, and the quality selector was fine there, full HD video.

Thank you in advance

Solved Locked المُؤرشفة 19 1029

Tabs on bottom

Hi OK so I was having some issues with firefox where I had to reinstall it and this did in fact resolve the issues I was having. Problem I have is this though when I r… (read more)

Hi

OK so I was having some issues with firefox where I had to reinstall it and this did in fact resolve the issues I was having.

Problem I have is this though when I reinstalled it I first backed up my chrome folder which had all my custom CSS to move the tabs to the bottom of the header area and when I then reinstalled FF I then copied the folder back into my profile folder using the More Info under the help menu to make sure I was in fact in the right profile folder.

Problem is the code isn't moving the tabs and I seem to remember some issues with this the last time we had to fix FF that something had changed with the Chrome folders and such.

So what do I need to do to get my tabs back on the bottom again as I hate them up top!

Version: 128.0.3

Thanks!

Solved المُؤرشفة 5 980

All my Firefox tabs disappeared – can I recover them?

I had a lot of tabs open in Firefox, and they always stayed there even after restarting my PC. But suddenly, all of my tabs disappeared, and I can’t recover them using “R… (read more)

I had a lot of tabs open in Firefox, and they always stayed there even after restarting my PC. But suddenly, all of my tabs disappeared, and I can’t recover them using “Recently Closed Tabs.” Can I get them back?

Solved المُؤرشفة 2 969

How do I set my bookmarks in toolbar to open in new tab?

While using an opened tab which I want to keep in place, I find it frustrating that if I want to click on one of my bookmarks in my toolbar, it uses the tab I am currentl… (read more)

While using an opened tab which I want to keep in place, I find it frustrating that if I want to click on one of my bookmarks in my toolbar, it uses the tab I am currently in which, of course disappears and is overridden with my selection of a bookmark. Is there a setting for me to change how my choosing of a bookmark reacts? I want it to open in a new tab and not on the one I am working with. I have looked everywhere and I cannot find a setting for this.

Solved المُؤرشفة 7 967

Can't backup or copy profile since 141

Roughly every 2 weeks I backup important files to a external hard drive. One of the things I always backup is my Firefox profile. I have been doing this for years without… (read more)

Roughly every 2 weeks I backup important files to a external hard drive.

One of the things I always backup is my Firefox profile. I have been doing this for years without any problems.

I 7zip my profile and copy it to the hard drive.

I tried to do this yesterday (July 25 2025), and was getting access denied messages for files in the profile. So I tried to simply copy the profile. Same thing access denied.

I cleared the history, used wise disk cleaner, rebooted my machine and tried again. Same thing access denied when trying to backup or copy the profile.

I am assuming that this is happening since 141 because I updated Firefox since the last time I backed up my profile, and never had a problem previously.

Could anyone have an idea what the problem is? Thank you for your time.

Solved المُؤرشفة 16 939

Lost my entire bookmark bar and collection after last update

I have lost all of my bookmarks, bookmark tool bar after Firefox's last update. I have spent the last day trying to recover what has been lost but I am having no luck in … (read more)

I have lost all of my bookmarks, bookmark tool bar after Firefox's last update. I have spent the last day trying to recover what has been lost but I am having no luck in getting everything back in place. I have tirelessly gone over all your possible remedies and get no results. I can't even send a message to Mozilla through their help messaging system. My only recourse appears to start using another web browser. If I can't talk to someone who can help guide me through a mess I did not cause, then I am forced to find another company that is responsive to my problems. Call me at [edited] or write me at [edited] if you want to keep me as a user of your service. Regards Mark Hannah

[edited email and phone# from community support forum]

المُؤرشفة 1 930

AI Integration Concerns

I am very disappointed to learn that Firefox is moving forward with AI integration. I use this browser specifically because there is no AI. AI tools are a drain on public… (read more)

I am very disappointed to learn that Firefox is moving forward with AI integration. I use this browser specifically because there is no AI. AI tools are a drain on public resources such as clean water and electricity, and the data centers that host the AI servers are a burden in many ways on the communities where they're built.

Additionally, I am concerned that the AI will turn all of our browser history into an AI slop ad factory where our data is more easily collected and sent off to generate more ads.

If AI is integrated into FireFox, I will no longer use this browser, even if the AI can be "turned off".

Is there any way to keep AI out of FireFox?

المُؤرشفة 1 915